src/cmark_ctype.c

#include <stdint.h>

#include "cmark_ctype.h"

/** 1 = space, 2 = punct, 3 = digit, 4 = alpha, 0 = other
 */
static const int8_t cmark_ctype_class[256] = {
	/*      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f */
	/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0,
	/* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* 2 */ 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	/* 3 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2,
	/* 4 */ 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
	/* 5 */ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2,
	/* 6 */ 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
	/* 7 */ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 0,
	/* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* c */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* d */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* e */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	/* f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/**
 * Returns 1 if c is a "whitespace" character as defined by the spec.
 */
int cmark_isspace(char c)
{
	return cmark_ctype_class[(int8_t)c] == 1;
}

/**
 * Returns 1 if c is an ascii punctuation character.
 */
int cmark_ispunct(char c)
{
	return cmark_ctype_class[(int8_t)c] == 2;
}

int cmark_isalnum(char c)
{
	int8_t result;
	result = cmark_ctype_class[(int8_t)c];
	return (result == 3 || result == 4);
}

int cmark_isdigit(char c)
{
	return cmark_ctype_class[(int8_t)c] == 3;
}